<?php


namespace Packages\Upload\Services;


use App\Tools\Common;


class UploadService
{
    // id
    private $accessKeyId;

    // 密钥
    private $accessKeySecret;

    // 上传host
    private $host;

    // 上传回调地址
    private $callbackUrl;

    // oss资源访问地址
    private $staticUrl;

    public function __construct()
    {
        // id
        $this->accessKeyId = env('ALIOSS_ACCESS_KEY_ID');
        // 密钥
        $this->accessKeySecret = env('ALIOSS_ACCESS_KEY_SECRET');
        // 上传地址
        $this->host = 'https://' . env('ALIOSS_BUCKET') . '.' . env('ALIOSS_END_POINT');
        // 回调地址
        $this->callbackUrl = env('ALIOSS_CALLBACK_URL');
        // oss资源访问地址
        $this->staticUrl = env('ALIOSS_STATIC_URL');
    }

    /**
     * 远程上传
     *
     * @param $param
     * @return array
     */
    public function remoteUpload($param)
    {
    }

    /**
     * 生成alioss上传凭证
     *
     * @param $param
     * @return array
     */
    public function genPolicy($file_dir = 'default')
    {
        $callback_param = array(
            'callbackUrl' => $this->callbackUrl,
            'callbackBody' => 'filename=${object}&size=${size}&mimeType=${mimeType}&height=${imageInfo.height}&width=${imageInfo.width}',
            'callbackBodyType' => "application/x-www-form-urlencoded"
        );
        $callback_string = json_encode($callback_param);

        $base64_callback_body = base64_encode($callback_string);
        $now = time();
        $expire = 30;  //设置该policy超时时间是10s. 即这个policy过了这个有效时间，将不能访问。
        $expire = $now + $expire;
        $expiration = $this->gmt_iso8601($expire);

        //最大文件大小.用户可以自己设置
        $condition = array(0 => 'content-length-range', 1 => 0, 2 => 1048576000);
        $conditions[] = $condition;

        // 表示用户上传的数据，必须是以$dir开始，不然上传会失败，这一步不是必须项，只是为了安全起见，防止用户通过policy上传到别人的目录。
        // $start = array(0 => 'starts-with', 1 => '$key', 2 => $dir);
        // $conditions[] = $start;

        $arr = array('expiration' => $expiration, 'conditions' => $conditions);
        $policy = json_encode($arr);
        $base64_policy = base64_encode($policy);
        $string_to_sign = $base64_policy;
        $signature = base64_encode(hash_hmac('sha1', $string_to_sign, $this->accessKeySecret, true));

        $response = array();
        $response['accessId'] = $this->accessKeyId;
        $response['host'] = $this->staticUrl;
        $response['policy'] = $base64_policy;
        $response['signature'] = $signature;
        $response['expire'] = $expire;
        $response['callback'] = $base64_callback_body;
        $response['staticUrl'] = $this->staticUrl;
        $response['dir'] = $file_dir . '/' . date("Ymd") . '/';  // 这个参数是设置用户上传文件时指定的前缀。
        $response['fileName'] = Common::getUuid();

        return $response;
    }

    /**
     * alioss上传回调
     *
     * @param $param
     * @return array
     */
    public function callback($request)
    {
        // 1.获取OSS的签名header和公钥url header
        $authorizationBase64 = "";
        $pubKeyUrlBase64 = "";
        /*
         * 注意：如果要使用HTTP_AUTHORIZATION头，你需要先在apache或者nginx中设置rewrite，以apache为例，修改
         * 配置文件/etc/httpd/conf/httpd.conf(以你的apache安装路径为准)，在DirectoryIndex index.php这行下面增加以下两行
            RewriteEngine On
            RewriteRule .* - [env=HTTP_AUTHORIZATION:%{HTTP:Authorization},last]
         * */
        if (isset($_SERVER['HTTP_AUTHORIZATION'])) {
            $authorizationBase64 = $_SERVER['HTTP_AUTHORIZATION'];
        }
        if (isset($_SERVER['HTTP_X_OSS_PUB_KEY_URL'])) {
            $pubKeyUrlBase64 = $_SERVER['HTTP_X_OSS_PUB_KEY_URL'];
        }

        if ($authorizationBase64 == '' || $pubKeyUrlBase64 == '') {
            header("http/1.1 403 Forbidden");
            exit();
        }

        // 2.获取OSS的签名
        $authorization = base64_decode($authorizationBase64);

        // 3.获取公钥
        $pubKeyUrl = base64_decode($pubKeyUrlBase64);
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $pubKeyUrl);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
        $pubKey = curl_exec($ch);
        if ($pubKey == "") {
            //header("http/1.1 403 Forbidden");
            exit();
        }

        // 4.获取回调body
        $body = file_get_contents('php://input');

        // 5.拼接待签名字符串
        $authStr = '';
        $path = $_SERVER['REQUEST_URI'];
        $pos = strpos($path, '?');
        if ($pos === false) {
            $authStr = urldecode($path) . "\n" . $body;
        } else {
            $authStr = urldecode(substr($path, 0, $pos)) . substr($path, $pos, strlen($path) - $pos) . "\n" . $body;
        }

        // 6.验证签名
        $ok = openssl_verify($authStr, $authorization, $pubKey, OPENSSL_ALGO_MD5);
        if ($ok == 1) {
            header("Content-Type: application/json");
            // $data = array("Status" => "Ok");
            echo json_encode($request->all());
        } else {
            //header("http/1.1 403 Forbidden");
            exit();
        }
    }

    private function gmt_iso8601($time)
    {
        $dtStr = date("c", $time);
        $mydatetime = new \DateTime($dtStr);
        $expiration = $mydatetime->format(\DateTime::ISO8601);
        $pos = strpos($expiration, '+');
        $expiration = substr($expiration, 0, $pos);
        return $expiration . "Z";
    }
}
